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    <title>acosm</title>
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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>acosm</b> -  matrix wise cosine inverse</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>t=acosm(x)  </tt>
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    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>x</b>
        </tt>: real or complex square matrix</li>
      <li>
        <tt>
          <b>t</b>
        </tt>: real or complex square matrix</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
      <tt>
        <b>t</b>
      </tt> are cosine inverse of the <tt>
        <b>x</b>
      </tt> matrix. Diagonalization
    method is used. For nonsymmetric matrices result may 
    be inaccurate.One has <tt>
        <b>t=-%i*logm(x+%i*sqrtm(eye()-x*x))</b>
      </tt>
    </p>
    <h3>
      <font color="blue">Examples</font>
    </h3>
    <pre>

A=[1,2;3,4];
cosm(acosm(A))
 
  </pre>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="acos.htm">
        <tt>
          <b>acos</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="sqrtm.htm">
        <tt>
          <b>sqrtm</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="logm.htm">
        <tt>
          <b>logm</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
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